What is the Inverting Mode The opamp can be connected up in various ways or modes What it does depends on how it is connected up When connected up in the inverting mode it changes positive voltages to negative voltages It may also make them larger ID: 163902
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Slide1
The Inverting Mode Op-AmpSlide2
What is the Inverting Mode ?
The op-amp can be connected up in various ways or
modes
.
What it does depends on how it is connected up.
When connected up in the inverting mode, it changes positive voltages to negative voltages. It may also make them larger.Slide3
The Inverting Mode Op-Amp
+
-
V
1
V
o
R
f
R
1
0 V
+V
s
-V
s
The
feedback resistor
(
R
f
) is used to control the gain of the op-amp.
The input voltage is fed in through the
input resistor
( R
1
).Slide4
Revision – The Gain of an Amplifier
You may remember from Standard Grade that the gain of an amplifier is the ratio of the output and input voltages.
The gain can also be expressed in terms of the resistors used to connect up the op-amp.
Slide5
The Inverting Mode Gain Equation
Slide6
Example 1
+
-
15 mV
V
o
200k
Ω
10 k
Ω
0 V
+V
s
-V
s
Calculate the output voltage from the op-amp below
.Slide7
Example 1 - Solution
Slide8
Example
2
+
-
15 mV
-6 V
R
f
10 k
Ω
0 V
+V
s
-V
s
What size of feedback resistor would be required to produce an output voltage of – 6 volts ?Slide9
Example
2 - Solution